/ Dictionary / Index H Hillis: Meaning and Definition of Find definitions for: Hil•lis Pronunciation: (hil'is), [key] born 1921, U.S. symphonic orchestra conductor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Hillingdon Hillman Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language